`{:("List I", "List II"),((A) H_2 + F_2, (1) "Slow in dark but fast in sun light"),(, " sun light"),((B) H_2 + I_2, (2) "Does not take place at"),(," room temp. but takes"),(," place at 593 K in hv"),((C)H_2 + Cl_2, (3) "fast in dark but slow in "),(," sunlight"),((D) H_2 + Br_(2), (4) "Takes place even in the "),(," dark (21 - 23k)"),(,(5) "Pt, 713 K and reversible"):}`
the correct match is

Options

A. `{:(A,B,C,D),(4,5,1,2):}`
B. `{:(A,B,C,D),(4,5,2,1):}`
C. `{:(A,B,C,D),(1,2,3,4):}`
D. `{:(A,B,C,D),(2,1,5,4):}`

Answer

To solve the matching question between List I and List II, we need to analyze each reaction and its characteristics.

### Step-by-Step Solution:

1. **Identify the Reaction for A: H₂ + F₂**
- The reaction of hydrogen and fluorine (H₂ + F₂) produces hydrogen fluoride (HF).
- This reaction is highly exothermic and can occur even in the dark and at low temperatures.
- **Match A with 4:** "Takes place even in the dark (21 - 23 K)."

2. **Identify the Reaction for B: H₂ + I₂**
- The reaction of hydrogen and iodine (H₂ + I₂) produces hydrogen iodide (HI).
- This reaction is reversible and requires the presence of a catalyst (like platinum) and elevated temperatures (around 593 K) to proceed.
- **Match B with 5:** "Pt, 713 K and reversible."

3. **Identify the Reaction for C: H₂ + Cl₂**
- The reaction of hydrogen and chlorine (H₂ + Cl₂) produces hydrogen chloride (HCl).
- This reaction occurs rapidly in the presence of sunlight but is slow in the dark.
- **Match C with 1:** "Slow in dark but fast in sunlight."

4. **Identify the Reaction for D: H₂ + Br₂**
- The reaction of hydrogen and bromine (H₂ + Br₂) produces hydrogen bromide (HBr).
- This reaction occurs at elevated temperatures (around 593 K) and can take place without light.
- **Match D with 2:** "Does not take place at room temp. but takes place at 593 K in hv."

### Final Matches:
- A → 4
- B → 5
- C → 1
- D → 2

Thus, the correct match is:
- **A4, B5, C1, D2.**